I bought a 2002 Ram 1500 with a 4.7 about 3 years ago. I got it for only $500 so i really couldnt pass it up. It had a blown engine. It took me about 2 years to be able to save for the engine. So the engine had been in for almost 1 yr now. It is a rebuilt. Lately it has been running real rough like when im at a red light it acts like it wants to stall but this only happens when the engine is hot. I have had to replace the crank sensor 2 times already. My question is: what would cause these to keep going out on me? Do you think there may be a problem with my pcm? Seeing how it did sit for about 2 years. Any ideas and help would be greatly appreciated.